Tube-making machinery



(No Model.)

J.'F. DONAGHY, J. HUMPHREY 8v W. GREGG.

TUBE MAKING MACHINERY.

No. 600,144. Patented Mar.8,1898.

UNITED STATES PATENT OFFICE,

ELLWOOD CITY,

PENNSYLVANIA.

TUBE- -MAKING MACHINERY.

SPECIFICATION forming part of Letters Patent No. 600,144, dated March 8, 1898.

Application filed July 12, 1897.

To all whom it may concern:

Be it known that we, JosEPH FRANK DONA- GHY, JOHN HUMPHREY, and WALTER GREGG, of Ellwood City, in the county of Lawrence and State of Pennsylvania, have invented certain new and useful Improvements in Tube- Making Machinery; and we do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to improvements in tube-making machinery; and it consists of two bevel-faced rolls, heads, or disks arranged at right angles to each other or any angle desired and having their axles in different planes, so that a billet of metal passed between the faces of said rolls will be engaged at points above and below its center upon opposite sides by the respective rolls.

The invention also consists of certain other novel constructions, combinations, and arrangements of parts, all of which will be hereinafter more particularly set forth and claimed.

In the accompanying drawings, forming part of this specification, Figure 1 represents a top plan view of a set of rolls embodying our invention, a billet being applied in position between the same; and Fig. 2 represents a side elevation of said rolls without the billet. 1

1 and 2 in the drawings represent the respective rolls, 3 the drill' or mandrel, and 4 the billet of metal. Said rolls 1 and 2 are mounted upon suitable axles or journals 5, mounted in any suitable form of frame, and are each formed with bevel contact-faces 6 and 7, extending at angles to each other. By reference to Fig. 2 the peculiar relative arrangement of the two rolls may be readily observed. This peculiar arrangement of the rolls causes a line drawn through the axle of one of said rolls to pass considerably above or below the central line of the axle of the opposing roll. By this structure when a billet of metal is passed between the two rolls said rolls engage the opposite sides of said billet above and below its center, so that upon Serial No. 644,222. (No model.)

able guides to hold the billet in position as it passes through between the rolls. By the peculiar arrangement of our improved bevelfaced rolls, arranged at right angles to each other and with their axles lying out of the same plane, the billet of metal is engaged above and below its center on opposite sides and thus fed evenly forward and at the same time rotated to cause it to pass over the mandrel or drill and thus leave the opposite sides of the rolls in the form of a tube.

It will further be observed that the point of contact between the rolls and the billet is practically in the same transverse plane as the operating portion of the mandrel within the tube, so that any spreading of the tube because of the operation of the mandrel will be avoided.

By the employment of our invention the use of hydraulic or other means to force the billet forward while being rotated is altogether obviated and the same fed evenly forward and simultaneously rotated, so as to be cut or penetrated by a rotated or stationary mandrel. The arrangement and operation are such that the feeding forward and rotation of the billet are positive, but at the same time yielding to a sufficient extent to prevent the destruction of the mandrel should the feed become faster than the mandrel is capable of cutting.

It will further be observed that the position of the billet is such as to throw it below the center of one of the rolls and above the center of the opposing roll and thereby hold it firmly in position and prevent it from being forced from between the rolls. Any suitable gearing may be employed to connect and operate the rolls, whereby they may be rotated in different directions simultaneously to feed the billet forward and give it the desired rotation.

The speed of the rolls may be regulated at will, so that the feed of the billet may be under the control of the operator.

Having thus described our invention, what we claim as new, and desire to secure by Letters Patent, is

1. In a tube-making machine, a pair of bevel-faced rolls arranged to rotate in planes at right angles to each other and so that the axle of one roll lies out of the same plane with the axle of the opposing roll, substantially as described.

2. In a tube-making machine, the combination with a pair of bevel-faced rolls arranged to rotate in planes at right angles to each other with their axles out of the same plane, of a mandrel adapted to receive the billet passed between said rolls, substantially as described.

3. In a tube-making machine, the combination with a pair of bevel-faced rolls arranged to rotate in planes at right angles to each other and with their axles out of the same plane so as to throw the center of one roll above the center of the opposing roll, of

a stationary mandrel adapted to receive the billet forced between the beveled faces of said rolls, substantially as described.

4. 111 a tube-making machine, the combination with a pair of rolls mounted to rotate in planes at right angles to each other and having double-beveled faces, the respective portions of which are arranged at angles to each other, axles supporting said rolls and arranged in. dilferent planes so that the center of one roll will lie above or below the center of the opposing roll, whereby a billet of metal will be supported and fed forward between said rolls, and a cutting-mandrel arranged to enter the billet fed between said rolls, substantially as described.

In testimony whereof we have signed this specification in the presence of two subscribin g witnesses.

J OSEPI-I FRANK DONAGI'IY. J OIIN IIUMPHREY. IVALTER GREGG.

Witnesses:

E. LEE BoYLEs, H. M. KIRK. 

